All your tags are in uppercase which is not allowed in XHTML. You also don’t end all your tags off which is also required by XHTML.
align=”center” is depreciated which is W3C’s way of saying don’t use it.

In your DTD you have HXTML where you need XHTML.

Sorry if it sounds like I’m having a go, its really good that you decided to make a tutorial. I just think its a bit misleading for people trying to learn XHTML.

19042011

andrei3600(02:31:41) :

shoot that fucking bird!

19042011

adriansantos12(03:15:36) :

This is an awesome tutorial thanks alot now i know how to edit websites and stuff hope you make more tutorials

19042011

HappyFaktor(03:27:06) :

This is a great, straight forward tutorial! Thanks so much for the upload. I can’t wait to learn more from you.

19042011

HappyFaktor(04:24:29) :

This is a great, straight forward tutorial! Thanks so much for the upload. I can’t wait to learn more from you.

19042011

FOGTALK(05:13:27) :

superb!

19042011

zackrichards1994(05:47:53) :

Good Video. Guys It is very helpful to use notepad++ instead of notepad. It color codes all tags and such, makes a document much more readable.

19042011

1DZM(06:05:39) :

nice video, the best

19042011

websitemaster7799(06:15:21) :

hey guys watch my tutorials on how to make a website /watch?v=cCJHPobmjMg

19042011

mc10wp(06:32:16) :

It’s br /, not /br. And by the way, you didn’t close your body tag right. Also, you left out a quote before the version for the xml header, which isn’t actually necessary in an XHTML document.

19042011

ClickyClick123(06:54:14) :

Great tutorial, but you don’t need me to repeat what the last 100 or so comments have just said.

I do think maybe you should try and answer some of the questions put forwards though. Some people need help! =)